old vs worn

old is a noun but worn is not a noun.

Word	Noun	Adjective	Verb	Adverb
old	Yes	Yes	No	No
worn	No	Yes	No	No

old (noun)	worn (noun)
past times

old (adjective)	worn (adjective)
of long duration; not new	affected by wear; damaged by long use
(used especially of persons) having lived for a relatively long time or attained a specific age	showing the wearing effects of overwork or care or suffering
skilled through long experience
(used for emphasis) very familiar
excellent
just preceding something else in time or order
belonging to some prior time